Loads of threads on here about blow job cum - spit/swallow etc. Many girls seem to know when the deed is about to happen and take their preferred course of action. But for those who take it all how do you know how it will go off , so to speak, and assuming it is with a regular partner, is it always the same ? Perhaps one heavy blast and several short ones or whatever but is it always the same ? Does the amount depend on lets say the intensity of your efforts?